274840661 has 2 divisors, whose sum is σ = 274840662. Its totient is φ = 274840660.

The previous prime is 274840651. The next prime is 274840663. The reversal of 274840661 is 166048472.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 224700100 + 50140561 = 14990^2 + 7081^2 .

It is a cyclic number.

It is not a de Polignac number, because 274840661 - 2⁶ = 274840597 is a prime.

It is a Sophie Germain prime.

Together with 274840663, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (274840663) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 137420330 + 137420331.

It is an arithmetic number, because the mean of its divisors is an integer number (137420331).

Almost surely, 2^274840661 is an apocalyptic number.

It is an amenable number.

274840661 is a deficient number, since it is larger than the sum of its proper divisors (1).

274840661 is an equidigital number, since it uses as much as digits as its factorization.

274840661 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 64512, while the sum is 38.

The square root of 274840661 is about 16578.3190040486. The cubic root of 274840661 is about 650.1701022267.

The spelling of 274840661 in words is "two hundred seventy-four million, eight hundred forty thousand, six hundred sixty-one".